1) Describe the toughening mechanisms found in the nano-size block copolymer rubber-toughened epoxy. Why this this toughened epoxy system is attractive as a commercial product for many structural applications

it is the most commonly accepted one

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.